PRO-CF 8.2NR 8 Mid-Bass Water Resistant Loudspeaker DS18 has an amazing line of loudspeakers that are not only water proof, they are centered around a Neodymium magnet, with super strong rubber surround, and high tech carbon fiber cones that gives not only great looks, but very high sensitivity levels for an amazing water resistant speaker that you can play loud and clear out in the elements. SPECIFICATIONS Nominal Diameter 8 / 203mm Nominal Impedance 4 ohms RMS Power Handling 300W MAX Power Handling 600W Sensitivity (1w/1m) 99dB Frequency Response 63Hz-12KHz Recommended HI Pass Crossover80Hz Pair or Single Single Grill Included No MOTOR Voice Coil Diameter 2 / 50mm Voice Coil Former Material Kapton Winding Material CCAW Cone Material WP Carbon Fiber Dust Cap Material WP Carbon Fiber Surround Material Rubber Basket Material Steel Basket Color/Finish Gloss Black Magnet Material Neodymium Rings Magnet Weight 0.3K g MEASUREMENT Overall Diameter 8.29 / 210.7 mm Overall Depth 3.38 / 86mm Front Mount Baffle Cutout 7.16 / 182mm Mounting Depth 3.2 / 81.5 mm Motor Diameter 4.45 / 113mm